Design Of Data Acquisition System For Hybrid Optical Current Transformer

Current transformer for power system control, protection and measurement equipment, and its accuracy and reliability of the electricity system is safe, reliable and stable operation has a significant impact. With the continuous development of the power system of the current transformer to a higher demand by the conventional electromagnetic current transformer operation exposed in a series of serious shortcomings, it is difficult to meet the requirements of the digital station. Therefore, a new type of electronic current transformers in place of the conventional electromagnetic current transformer has become the inevitable trend of development, Optical Current Transformer with security as a result of good performance, low manufacturing costs, operation and high precision, small size, light weight and low maintenance costs, the current study has become a hot spot at home and abroad.The paper first provides an overview of domestic and foreign electronic Transformer Electronic Transformers the status quo, as well as the basic structure and working principle. On this basis, a comprehensive account of the cost, reliability, accuracy and usefulness of design, etc. Hybrid optical current transformer data acquisition system, including signal processing part of the hardware design, digital transformation modules and the design of optical transmission unit.Signal processing part of the hardware design, including signal integration, filtering, and some other polar transform, In accordance with the needs of low-power system for selection of the corresponding chip, System function will be part of the first in the OrCAD/PSpice in the signal simulation, with the design requirements for debugging, and thus improve the circuit design problem. . Digital conversion unit is used Verilog HDL hardware description language through the Quartus II software platform designed, Main sequence detection, A/D sampling control, CRC checksum function modules, such as Asynchronous Receiver Transmitter. Design using 16-bit micro-power high-speed A/D chip ADS8325 as the A/D converter, and ensuring the accuracy of data acquisition, real-time and low-power system; The use of low-power, low-cost, high-performance of the MAX II family of control devices do EPM1270 chip, reducing system power consumption to improve the performance of the controller; in the high and low pressure side by the optical fiber for signal transmission, between a high and low pressure electrical isolation, the design of a low-power fiber-optic firing circuit driver.The author used this research (High Voltage Apparatus Research Intelligence) of the photoelectric transducer developed testing systems designed for this paper test results are given and an analysis of errors. The full text of the final paper work for summing up, to be further studied and resolved.